HP Deskjet D4200 series
My printer starts to print each document clearly then fades to grey about a third of the way down the first page.Subsequent documents are the same. There is no indication that the cartridge is empty.The printer is still under guarantee.

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Sorry, I don't have one. Mine was a different problem; incompatibility between my old hp desk jet 5650 and my new Mac Book Pro. Just needed a newer printer!
When something like what you describe happens it is because the cartridge is dry; I change the cartridge.

Once it is installed, it will be ready to print from internet.
OR add a printer Deskjet 990c and it will start printing.
Please click on Start---Control Panel----Printers and faxes----Add a printer----Add a local printer----
Select Use an exhisting port-----Please select LPT1 and under that select USB001
----Next----On left Select HP----
On right select HP Deskjet 990c series series series----Next----Next----Select do not share this printer----Next----Print a test page----Finish